I've been working here for a few years and while there are plenty of women in management roles it seems like they have a harder time getting those positions and are often questioned about their decisions. There are also more rules dictating how women should dress than the men and general conversation always brings up "the girls in the office" or "the guys in the field" despite having both genders in both places. The higher you get up in management the more and more hours you're expected to work until you have zero time for anything else.
Update (July 2016): The company has now made changes to the handbook that are less strict about what women (and men) must wear.